English as a second language; ESL; TESOL ; Wortschatz (Sprachunterricht) ; Lernwortschatz; Vocabulary teaching ; Lexikalischer Zugriff; Lexical decision; Lexical access; Word recognition ; Kindersprache (Sprachverständnis) ; Children's comprehension of language; Language comprehension in children ; Zweitspracherwerb (lex.) ; Second language acquisition (lex.) ; Vocabulary (second language acquisition) ; Second language acquisition in children; Kindlicher Zweitspracherwerb; Child second language acquisition ; English